Continuous confection freezing apparatus



I June 17, 1941. Q c so ETAL Re. 21,827

CONTINUOUS CONFE CTION FREEZING APPARATUS Original Filed Dec. 20, 1957 sSheets-Sheet 1 CHARLES ERJCKSON 1w ERICK SPELLMAN INVENTORS ATTORNEYCONTINUOUS CONFECT ION FREEZING APPARATUS Original Filed Dec. 20, 1957 3Sheets-Sheet 2 LL :3 b

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M T- g 1 h iun liillml q i H ,lihirg'm. I, CHARLESERICKSON M ERICKSPELLMAN I INVENTOR. 02

ATTORNEY.

I Re. 21,827

- 3 Sheets-Sheet 3 June 17, 1941. c. ERICKSON ETAL CONTINUOUS CONFEGTIONFREEZING APPARATUS Original Filed Dec. 20, 1957 CHARLES ERICKSON ANDERICK SPELLMAN MENTOR TME ENE r zone to the discharging head of saidmachine;

seamed June n, 1941, o

" OFFICE.

Iriohon and his: snnnmn,

New run-n. y.

on h m. 2,191,344, dated February :0, 1m. SerialNo. IQOJOLDeeeInbes-M,1,87. Application fol-reissue freezing confection, ice creams andwstards. etc,

in continuous operation, without the use of iceand salt, andparticularly that type which is completely self-contained. andautomatlc'in operation. The object of our invention is top)- .vide anautomatic machine for freezing various types of creams, custards, andthe like, in continuou's operation and capable of producing a uniform,smooth product of the highest quality.

Another object is to have a machine'of this character which operatespositively without using any pump or-the like, for forcing the fluidstarting material through the machine in order to feed the cream or thelike, through the freezing a further object is to construct a m of thischaracter in" such direct and simpleman- 'ner thatthe samemaybereadilydisassemhled for cleaning and all parts requiring attentionare easily accessible. 1

It is also an object of our invention to provide a machine of this typewith a special feed shaft p substantial in construction, and economicaland highly efficient in operation.

Another object could bementionedsuch as providing not only the mainportion of the machine with chilling coils for freezing the product 1,194., Serial No.

:1 Claims. (or sz-nn upper portion ofthe front end of the machinedisclosing the interior construction and the re lations of the parts.

Fla. 3 is a front elevation of the same machine. 4 is a transversesection of the machine upon line IV-IV in Fig. 2.

Fig. 5 is a transverse section of the feedshaft of the machine taken online V-V in ll 'ig. 2. Fig. 6 is a front elevation of the same feedshaft.

Finally, Fig. 7 is a side elevation of the feed shaft in erect positionand showing diiferent angular positions of some of the parts than inFig, 2; due to partial rotation from the position of said shaft in thelatter figure. Throughout the views thesame reference nuv metalsindicate the same or like parts.

within a cylinder in which the feed shaft rotates,

l but also providing a receptacle beneath thehead otthe machine withchilling coils to retain the finished product in freezing condition whenreceived in said receptacle from said head;

inherent in the design. construction, principles and operation of ourmachine will become more apparent in detailed manner as thisspecification proceeds.

In order to bring out the features of in- -venti0n in acomprehensivemanner, the same is illustrated by way of example in apractical form in the accompanying drawings which form part hereof.

Hence, in Fig. 1, a machine made according to our invention is shown insideelevation.

Pig. 2 is a longitudinal section through the HenceJn the practice of ourinvention, atable In the confectionery freezing arthorisontal freezingapparatus has become a vogue and not without reason. It is theoreticallyattractive to feed cream, or the like through a horizontally pearedheretofore for several reasons, the main .reason being that saidmachines have not been refrigerated by coils but by ice and salt; andanother reason being that no practical andpermissible means have untilnow-been available in view the present invention isintended to place'theartoffreezingcreamsandcustardsuponan;

entirely new basis and introduce a new standard of mechanicalexcellence, eiiicienc'y of operation, and quality of product.

generally indicated at I and provided with legs similar to 2 and 3, isprovided with .an upper supporting portion or top 4, and the lower shelfor supporting portion upon which a mechanical freezing unit, representedby the rectangle 9, is disposed. This.unit may be electrical and of anysuitable type, and in this respect the particular form of such freezingunit is of no consequence as several types are on the market, but in anycase such freezing unit has tubes 1, 8, 9 and I9 and circulates afreezing fluid to various parts of the machine as will presently beexplained. It might, however, be mentioned that pipes 9 and Ill may becontrolled by valves ll and II respectively, while, on the other'hand,

an automatic master control valvemay be connected to both pipes 9 andIII in order to control flow through the same, and may even "be arrangedto control pipes I and 9 in addition, and for this purpose pipes I and8, as-well as pipes 9 and I9 may be connected in parallel or they may beconnected in series.

Above the freezing unit 6 upon the table top 4 is a horizontallydisposed cylinder I3 around which pipe coils similar to l4 are closely=wound from practically one endof said cylinder to the other, said coilsconnecting with pipes l and Bpreviously mentioned, so that freezingfluid from the freezing unit 6 may circulate about the cylinder andchill the wall thereof from end to -end. The cylinder-is provided at theforward end with a heavy supporting plate and at the rear with a similarsupporting plate It, both of which rest upon the table top 4 and arerigidly secured to the same. Aboutthe pipe coils l4 upon the cylinder isa heavylayerof insulating mineral wool H, or the like and. a sheet metalcover I9 is arched over the whole between the end plate It and ii andsecured down upon or adjacent to the table top 4 so that the mentionedwool orflbrous insulating material about they pipe coils will be kept inplace and concealed from view. Within the cylinder i3, is an axiallydisposed feed shaft H which passes through a bearing in the rear platel6, and is connected by a reducing gear mechanism 2| to a motor or-other drive 22, the details of these last mentioned parts beingsuperfluous to illustration as forming no essential part of the noveltyof the present invention and being merely conventional.

, The front end of the shaft is carriedin a hear-- ing formed in adischarging head 23 removably secured upon the front plate i5 bymeans ofhand screws 24, 24, etc., this discharging head having an interiorflange 25 which effectively centers said head and thereby the bearingportion 29 of shaft l9. The features and operation of the feed shaftwill be presently explained.

At a higher level than that of the cylinder l3,

preferably at the rear of the machine, is a removable tank or supplycontainer 21, having a top opening 29, through-which to introduce. aliquid mixture afterward intended to be frozen in the machine. saidsupply container being sup,- ported upon a pair of brackets-similar to29 having upright portions 39. secured upon the table top 4, and, ifdesired, also steadied by means of a bolt It or the like, secured torear plate It.

The supply tankv or container 21 may have acylindrical form or any otherform that is found convenient, and is providedat the lower portion withoutlet control valve 32 and a feed pipe 33 which terminatesapproximately above the center of a funnel or receiving cup 34 which isscrewed or otherwise attached to the upper part of the freezing zone ofthe cylinder but also in a meas-' container placed into positionuponbrackets 29,

it .is obvious that upon opening valve 32 to the proper degree acontinuous stream of fluid will descend from pipe 33 into the receivingcup 34, and said fluid will then descend at a predetermined rate throughbottom aperture 35 of said cup into the interior of the cylinder to bebeaten and frozen and also propelled forwardly to the front and expelledas will be immediately explained.

The'sald shaft I9 is provided near its rear end within cylinder 13, witha group of beaters 36, 31,

39, each of which may be perforated as-at 39.

The beaters or paddles serve to beat or churn the fluid custard in therear portion of the cylinder as the mix enters and said mix is subjectedto a predetermined chilling or initial freezing, and in V order to makecertain that the beating is effective and no accumulation of materialoccurs upon any portion of the interior wall of cylinder H, a veryslightly curved scraper 49 is arranged upon the shaft, being fixed orsupported thereon by means. of radial arms 4|, 4|, etc., each arm beingsecured upon the shaft by means of a ring or member 40'. The sphere ofoperation of the above mentioned paddles and scraper may be termed thefirst or chilling zone in as much as two other zones follow in thecenter and forward portions of the cylinder. The second zone forms thesphere of operation of a smooth, spirally shaped or curved scraper 42which is mounted on arms 43, 43', etc., each secured to a collar ormember 42' rigidly fastened to the shaft i9, and serves not only toscrape the sides in the first actual ure to propel the frozen materialforwardly toward the front of the machine. It is to be noted that thearm 4| supporting scraper 49 is secured to the same member 40. as arm 43which supports scraper 42 and is disposed at an angle thereto whichmaybe a right angle, approximately as shown in Figs. 2, 4 and 7.

The third freezing zone'within the cylinder is scraped by a scraper 44having a curvature which is more pronounced than that of scraper 42 sothat it will have not merely a scraping effect but an inclining shavingeffect with respect to the direction of rotation, and will also tend topropel frozen custard or the like in a forward direction. It is thusevident that'the scraper 49 which is but slightly curved out of parallelwith shaft I9, is succeeded by a scraper42 which is more curved, whilescraper 44 is given a greater curvature than either of the previousscrapers because the frozen material as it advances through the cylindertends to be frozen to the walls of said cylinder in a condition ofincreasing 7 the arm 45 being secured to the same mounting member 42' asarm 43' supporting scraper 42 and disposed at an angle thereto, whichmay be less'than or about the first arm supporting each scraper beingdisposed in advance of the last arm supporting the preceding scraper inthe series.

Upon the forward end'of the shaft is fixed an expelling device somewhatresembling a screw propeller generally indicated at 46 and provided Thegeneral profile of with spiral blades 41, 41. the forward portion of theexpelling device is preferably conical and registers just short ofcontact with the conical interior of the discharging head 23 immediatelywithin the bearing portion 26 which supports the outer end 43 of theshaft. The discharging head is formed with a downwardly extendingportion 43 through which a discharging channel ill communicates with theinterior of said head in order to allow the frozen custard or othermaterial to issue from said discharging headunder the propelling actionof the feeding shaft 19. In this description, it has of course, beentaken for granted that the pipe coils l4 surrounding the cylinder andhaving connected thereto pipes l and 8 with the freezing unit 6 havebeen in full operation so that the freezing fluid has been circulatingthrough said pipe coils so as to chill the cylinder.

charging head 23, the same is preferably allowed I to fall intocontainer 5| while the frozen custard freezing unit 6, while said holderand its cooling coils are wrapped with mineral wool, felt or other heatinsulating material 55 which is retainedin frozen condition for anindefinite period of time by reason of the cooling of said vessel bymeans of chilling coils 54.

Nevertheless, it may be observed that the length of shaft I9 is quiteconsiderable between the bearings and 26 thereof, so that the strain 1upon the shaft, intermediate the ends, caused by the scraping actionparticularly of scrapers 42 20 when, however, the frozen material issuesfrom the channel 50 in projection 43 upon the disor medium through thepipe coils l4 surroimding cylinder [3 and the coils 54 about thereceiving vessel 5| with the result that said cylinder, said holder, andthe vessel are chilled to a suflicient and predetermined extent causingsuccessful operation of the machine. ready been mentioned the freezingunit 6 may be electrically operated or operated fromany source of power,although this is not illustrated as being too conventional to requireshowing.

when the shaft I3 is in place and the discharging head 23 in position,it is but necessary to start the motor 22 or other drive to operatemechanism 2| and its shaft 64 which willthen cause shaft IS in cylinderl3 to rotate in continuous manner. Ifthen the freezing unit 6 is causedto start operation with the freezing medium circulating thru pipes I, 8,3 and I0 and the supply tank 21 is in position upon brackets 23 with asufficient supply of liquid custard or the like, it will merely benecessary to open control valve 32 to a predetermined extent to allow ameasured, flow of liquid custard or the like from pipe 33 to descendinto cup 34 and then thru aperture 35 into the interior of cylinder l3where it will be beaten by the paddles 36, 31, 38,

and initially scraped by the scraper 40 and propelled forwardly andfrozen upon the walls in the path of scraper 42 and scraped andpropelled forwa'rdly by scraper 42 and to some extent also by bearingvanes 59, 60, BI, and further propelled and scraped forwardly by scraper44 after which the frozen material will be urged out and expelled fromdischarging channel in discharging head 23 by the expelling device 46 soas to accumulate in the receiving vessel 5|. The operation if allowed'toproceed as just described,

' will be entirely continuous as long as a supply of and 44, will beconsiderable and to some extent unbalanced. In order to compensate forthe wide draft and in order to center the shaft and prevent bendingthereof and render the opera- 7 rear to the reducing gear mechanism 2 I,is preferably provided with a spider or other locking structure 82adapted to positively engage with projections 63 of a short shaft 84which actually extends beyond the rear bearing 20 into. the mechanism 2|so that it will be possible to withdraw shaft l3 forwardly from withinthe cylinder when the discharging head 23 has been released from thefront of the machine by unscrewing the hand screws 24, 24 for thepurpose of cleaning the interior of the cylinder and shaft. Although nomechanism is illustrated forthe freezing unit 6 in as much as thedetails are ,well known and form no part of the present invention perse, it is understood that the same may be of any type as long as itsuffices to supfluid is flowing into the receiving cup 34 through thepipe 33 from supply tank ,21. When the requisite amount of frozenconfection has been accumulated, it may be preferable to have'a plate orapron 52 above the holder 53, which might be 0 terminated then withinthe vessel 5|, or may simply terminate at its edge as preferred.

The material of which the various parts are made may be varied to suitcircumstances; for example, the freezing coil l4 and 54 may be of copperor bronze, or the cylinder may be of steel or white bronze, or any othermetal or allay, and the frame and main parts of the apparatus' may be ofiron, or steel, or more or less conventional, except as otherwisespecifically set forth herein. It is obvious that the shaft I9 and itsappurtenances should be of steel in order to be suiliciently strong, dueto the heavy strain imposed upon it. It may be noted that it is notalways essential that the scrapers shall have a definite pitch orinclination with respect to the shaft, but it is important that they areat least out of line. l

Manifestly, variations of our invention may be resorted to within a widescope, and parts ply a sufficient circulation of the freezing fluid maybe modified or used without others,'as long as the machine conforms tothe principles involved. i Having now fully described our invention, weclaim,

1. An apparatus for continuously freezing ice creams, fluid custards andthe like, comprising a fixed hollow cylinder, means for exteriorlycooling said cylinder to freeze the contents thereof, said cylinderhaving one end closed and being provided in the upper portion of thesame As has alwith a receiving cup connected with the interior 'of saidcylinder and also having at the other end a removable discharging head,a feed shaft rotatably disposed within the cylinder and connectedthrough the closed end of the latter with an exterior power-drive, therebeing a bearing in said closed end for said shaft and said shaft havinga hearing at the other end in said discharging head, at least oneagitating means secured upon the feed shaft below the general positionof said receiving cup for agitating fluid entering the cylindenfrom saidcup, a scraper secured on said feed shaft in approximately the "sameportion of the cylinder as said agitating means and having greaterlongitudinal extension than said latter means, and being furtherdisposed at a different angular position with respect to the axis of theshaft than said means, there being also an opening in the discharginghead allowing the rotation of the shaft to cause feeding of frozenmixture scraped by saidscraper from the walls of said cylinder outthrough said opening in said head to the exterior of the apparatus,there being also means for supplying liquid creams, custards and thelike to said receiving cup, and at least one additional scraper securedon the feed shaft intermediate said first scraper and the discharginghead and formedwith a definite screw'pitch in order to feed the frozenmixture forward from said agitating means and said first mentionedscraper toward the discharging head, and further means secured upon theshaft extending into said head for forcing the frozen material receivedfrom said additional scraper through the opening in said head.

2. An apparatus according to claim 1, wherein a further scraper havingscrew pitch is disposed intermediate the one additional scraper and thedischarging head, each of the scrapers scraping an individual portion ofthe interior wall of the' cylinder and contributing to the feeding ofthe frozen material toward the discharging head.

aired on the feed sum intermediate said first I scraper and thedischarging head and at a different angular position with respect tosaid axis than that of the first mentioned scraper so as to be out ofline therewith for the purpose of feeding the frozen mixture forwardfrom said agitating means and said first mentioned scraper toward thedischarging head, and further means secured upon the shaft extendinginto said head for forcing the frozen material received from saidadditional scraper through the opening in said head.

4. An apparatus according to claim 3, wherein a further scraper isdisposed intermediate the one additional scraper and the discharginghead out of line with the first and additional scrapers each of saidscrapers scraping upon an individual portion of the interior wall of thecylinder and contributing to the feeding of the frozen material towardthe discharging head.

5. An apparatus for continuously freezing ice creams, fiuid custards andthe like, comprising a fixed hollow cylinder, means for exteriorlycooling said cylinder to freeze the contents thereof, said cylinderhaving one end closed and being provided in the upper portion thereofwith a receiving cup connected with the interior of said cylinder andalso having at the other end a removablerdischarging head, a feed shaftrotatably disposed in said cylinder and connected through the closed endof the latter with an exterior power drive, there being a bearing insaid closed end for said shaft and said shaft having a bearing at theother end in said discharging head, a plurality of radially disposedbeating paddles secured upon the feed shaft below the general positionof said receiving cup for agitating fiuid entering the cylinder fromsaid cup, 'a scraper secured on said feed shaft in approximately thesame portion of the cylinder as said beating paddles and having greaterlongitudinal extension than said paddles and also 3. An apparatus forcontinuously freezing ice creams, fluid custards and the like,comprising a fixed hollow cylinder, means for exterior]! cooling saidcylinder to freeze the contents thereof. said cylinder having one endclosed and being provided in the upper portion of the same with areceiving cup connected with the interior ,of said cylinder and alsohaving at the other.

end a removable discharging head, a feed shaft rotatably disposed withinthe cylinder and connected through the closed end of the latter with anexterior power drive, there being a bearing in said closed end for saidshaft and said shaft having a bearing at the other end in saiddischarging head, at least one agitating means 812-- cured upon the feedshaft below the general position of said receiving cup for agitatingfluid entering the cylinder from said cup, a scraper secured on saidfeed shaft in approximately the same portion of the cylinder as saidagitating means and having a greater longitudinal extension than saidlatter meals, and being further disposed at a diiferent angular positionwith respect to the axis of the shaft than said means, there being alsoan opening in the discharging headallowing the rotation of the shaft tocause feeding of frozen mixture scraped by said scraper from the wallsof said cylinder out-through said opening in said head to the exteriorof the appadisposed at a different angular position with. respect to theaxis of the shaft than any of the paddles, a second scraper secured uponsaid shaft intermediate the ends. thereof and out of line .with thefirst mentioned scraper, a third scraper secured upon a forward portionof the same shaft out of line with the first and second scrapers. therebeing also a discharge opening in said discharging head, means forsupplying liquid creams. custards and the like to said receiving cup,and a discharging feed screw mounted upon the forward portion of thefeed shaft forwardly of the third scraper and extending into thedischarging head for forcing the frozen material 'from the threescrapers out through the discharge opening in said discharging head uponrotation of said feed shaft.

6. An apparatus according to claim 5, wherein the discharging head isinteriorly concave in the direction facing the interior of the cylinderso as to accommodate the feed, screw, and the said feed screw has agenerally convex profile lathe forward direction to correspond to theconcavity of said discharging head.

'1. 'An apparatus according to claim 5, wherein a plurality of radiallydisposed bearing members are secured to the feed shaft intermediate theends thereof and which tend to bear against the inner wallof thecylinder in order to support said shaft and resist. the strain imposedthereon ratus, there being also-means for supplying liquid creams,custards and the like to said receivin; cup. and at least oneadditionalscraper by operation of the scrapers.

8. An apparatus according to claim 5, wherein a plurality of radiallybearing plates are secured to the feed shaft intermediate the endsthereof and generally pitched in the same feeding direction as thedischarging feed screw, said bearing plates tending .to bear against theinner wall of the cylinder so as to resist the strain imposed upon saidshaft by the operation of the scrapers and to assist in propelling thefrozen -m aterial within the cylinder due to their forward pitch.

9. An apparatus according to claim 5, wherein the first mentionedscraper upon the feed shaft is slightly pitched in the forward feedingdirection so as to be nearly perpendicular with the axis of the shaft,and wherein the second scraper is provided with an increased pitch inthe same feeding direction as that of the discharging feed screw andwherein. the thirdscraper has an even greater and more emphasized pitchin the same v feeding forward direction.

10. An' apparatus according to claim 5, wherein the three scrapers arelocated in three continuous and successive freezing zones in thecylinder, the first zone being .a preliminary chilling zone in which thefirst scraper operate adjacent to the receiving cup, the second zonebeing a positive freezing zone in which the second scraper operates, andthe third zone being a'hard freezing andfflnishing zone in which thethird scraper. operates in proximity to the forward end of the cylinder,said zones being disposed in, line and forrriing continuous portions ofthe interior of the cylinder and'having the same general diameterthroughout.

11. An apparatus according to claim 3, wherein a further scraper isdisposed intermediate the one additional scraper and the discharginghead, and the three scrapers are disposed out-of line with respect toeach other and individually in different'angular positions with respectto the axis of theshaft, each of the scrapers scraping upon anindividual portion of the interior wall of the cylinder and contributingto the feeding of the frozen material toward the discharging head, andby virtue of the individual radial position thereof also distributingthe strains imposed upon said shaft by the scraping action of eachscraper, and wherein the shaft has a discharging feed screw at theforward end cooperating with one agitating means mounted upon the feedshaft in proximity to the general location of said receiving cup foragitating fluid entering the cylinder from said ,cup, a scraper, ascraper arm mounting fixed upon and surrounding the shaft between thedriven end thereof adjacent the power drive and the agitating means andrigidly carrying a scraper arm for supporting one end portion of saidscraper, a second scraper arm mounting fixed upon and surrounding saidshaft between the agitating means and the discharging head or forwardend of said shaft and rigidly carrying a second scraper arm forsupporting the other end of said scraper, a second scraper, a thirdscraper arm rigidly carried by said second scraper arm mounting forsupporting one end portion of said second scraper, said third scraperarm being disposed at an angle to the second scraper arm, and a thirdscraper arm mounting fixed upon and surrounding said shaft between thesecond scraper arm mounting and said forward end of the shaft andrigidly carrying a fourth scraper arm for supporting the other endportion of said second scraper, said th'irdand fourth scraper armssupporting said second scraper out of line with respect to said firstscraper.

14. Apparatus according to claim 13, wherein the second and thirdscraper arms which are dis- I posed at an angle with each other are alsodisposed in substantially the same transverse plane with respect to theaxis of the shaft, and each scraper arm mounting comprises a ring orcollar upon the shaft having the scraper arms substantially integraltherewith.

15. Apparatus according to claim 13, wherein each scraper arm mountingcomprises a ring or collar upon the shaft, the several collars formingthe 'scraper arm mountings being spaced apart in p a series along theshaft.

the discharging head so as to force frozen material out through the ofsaid shaft with its scrapers.

12. An apparatus'according to claim 3., wherein the further meanssecuredupon the shaft ex- Atendin'g into the discharging head comprisesa feed screw of generally convex profile, the discharging head having acorresponding concave portion to receive said feed screw, and whereinsaid discharging head has a flange adjoining said concave portion-forthe purpose of fastening onto the open end of the cylinder in order tocenter said head in position upon said end.

13. An apparatus for continuously freezing ice creams, fluid custardsand the like, comprising a fixed hollow cylinder, means for exterioriycool ing said cylinder to freeze the contents thereof, there being meansclosing one end of the cylinder discharging opening therein from withinthe cylinder upon rotation (all and a receiving cup upon the lattercommunicating with the interior of the cylinder, said cylinder having atthe other end thereof a rcmovabledischarging head, a feed shaft adaptedto be rotatably disposed within the cylinder and connected through saidfirst one end with for power drive for rotating the same, t e "11+ alsoa bearing in the same one end for n. r

16. Apparatus according to claim 13, wherein a further or fourth scraperarm mounting is fixed upon and surrounds the feed shaft between thethird scraper arm mounting and the forward end of said shaft, and athird scraper is included, while a fifth scraper arm is rigidly carriedby the third scraper arm mounting for supporting one end portion of saidthird scraper in addition to the fourth scraper arm also carried by saidscraper arm mounting, and wherein the fourth scraper-arm mounting uponand surrounds the shaft between the third scraper arm mounting and theforward end of said shaft rigidly carries a sixth scraper arm forsupporting the other end portion of said third scraper, and said fifthand sixth scraper arms support said thirdscraper out of line withrespect to'thesecond scraper,

1'7. An apparatus for continuously freezing ice creams, fluid custardsand the like, having a feed shaft or dasher, including a shaft proper,at least three scraper arm mountings fixed upon and surrounding saidshaft in a spaced series, an agitating means fixed upon the shaftbetween the first and second scraper arm mountings, at least twoscrapers, .a scraper arm rigidly carried by first and third scraper'armmountings for sun th third scraper is disposed in advance of the secondscraper arm supported on the same member or mounting therewith, so as tocause the second scraper to be disposed anguiarly in advance of thefirst scraper.

19. Apparatus according to claim 13, including additional scraper armssupported in fixed positions upon the shaft intermediate the first andscraper in common with the two scraper arms second scraper arms on theone hand, and inter'-' mediate the third and fourth scraper arms on theother 'hand, the third and fourth scraper,

arms with the intermediate scraper arm therebetween all beingindividually disposed angularly in advance of the first and secondscraper arms and the scraper arm between the latter two.

20. Apparatus according to claim 13,including additional scraper armshaving scraper arm mountings supporting the same and fixed individuallyin predetermined positions upon the shaft intermediate the first andsecond scraper arms on the one hand, and intermediate the third andfourth scraper arms on the other hand,

the third and fourth scraper arms with the in termediate scraper armtherebetween all being individually disposed angularly in advance of thefirstand second scraper arms and the intermediate scraper arm betweenthe latter two, and the intermediately disposed additional scraper armsserving in each case to support the same between which said additionalscraper arms are individually located. t

21. Apparatus according to claim 13, having a further or fourth scraperarm mounting fixedly surrounding the feed shaft between the thirdscraper arm mounting and the forward end of said feed shaft, a thirdscraper, a fifth scraper.

' arm also rigidly disposed upon said third scraper. arm mounting inaddition to the fourth scraper I arm and serving to support one'endportion of said third scraper, a sixth scraper arm rigidly disposed uponsaid fourth scraper arm mounting for supporting the other end portion ofsaid thirdscraper, the third scraperarm being disposed angularly inadvanceof the second scraper arm supported on the same scraper-armmounting therewith, whilethe fifth scraper arm I i also disposedangularly in advance of the Q fourth scraper arm supported on the samescraper arm mounting with said fifth scraper arm, so that the thirdscraper is carried on its supporting arms angula'rly in advance of thesec- I on'd scraper and said second scraper is in'tur'n carried on itssupportingarrns angularly in ad- Vance of the first scraper.

ERICK SPELLMAN.

CHARLES? ERICK-SON. g

